防ぼう御ぎょ率りつぼうぎょりつMeanings1nounearned run average; ERAbaseballBaseball term for the average number of earned runs a pitcher allows per nine innings.彼かれの防ぼう御ぎょ率りつは2.50で、リーグトップだ。His ERA is 2.50, the best in the league.
